EP2157712A1 - IR-lens for audio transmission - Google Patents
IR-lens for audio transmission Download PDFInfo
- Publication number
- EP2157712A1 EP2157712A1 EP09164287A EP09164287A EP2157712A1 EP 2157712 A1 EP2157712 A1 EP 2157712A1 EP 09164287 A EP09164287 A EP 09164287A EP 09164287 A EP09164287 A EP 09164287A EP 2157712 A1 EP2157712 A1 EP 2157712A1
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- EP
- European Patent Office
- Prior art keywords
- radiation
- infrared
- signals
- deflection structure
- optical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/1141—One-way transmission
Definitions
- the invention relates to a device for vehicles for the transmission of optical signals according to the preamble of claim 1.
- An apparatus for transmitting optical signals is for example from the document DE 197 25 898 A1 known.
- This document discloses an entertainment system for vehicles, wherein from a signal source, infrared signals are transmitted via an optical fiber to an infrared transmitter, which transmits the infrared signals to infrared receiver in the vehicle.
- the infrared transmitter due to the distance to the infrared receiver on a correspondingly broad radiation characteristic the infrared transmitter due to the distance to the infrared receiver on a correspondingly broad radiation characteristic.
- the object of the present invention is seen to provide a device for transmitting optical signals, which enables improved reception for receivers.
- the invention relates to a device for vehicles for transmitting optical signals, for example infrared signals, which comprises an optical radiation source which has a predetermined radiation characteristic with a preferred direction.
- the core of the invention is that a deflection structure according to the invention is provided in the radiation path after the radiation source, with which a deflection of the preferred direction of the radiation characteristic can be achieved.
- the invention is based on the finding that, due to a deflection of the preferred direction, targeted irradiation of an optical receiver can be carried out. At the same time, optical receivers located further outside the radiation field will not be illuminated. This results in efficient irradiation of the desired receiver with the optical signal.
- Such a deflection of an optical signal, for example, a passenger, starting from an optical radiation source, are selectively irradiated to supply, for example, an electronic device on the passenger or in the vicinity with data signals.
- an optical radiation source such as For example, an infrared radiation source
- the optical signals in a "cone of radiation" to a receiver.
- Radiation cones of LEDs emitting in the infrared range regularly have a solid angle of 10 to 60 degrees.
- a number of radiation sources, especially for infrared light can also transmit with a much smaller radiation cone.
- the signal may only receive unwanted loss of quality.
- the deflection structure has an inclined surface with respect to the radiation direction of a radiation source.
- the inclined surface may deflect the radiation direction of an incoming infrared signal, thereby changing the preferential direction of the radiation pattern.
- the optical ratios are chosen such that refraction to the normal to the inclined surface occurs upon penetration of the light.
- a plurality of inclined surfaces may be provided.
- the surfaces may, for example, be arranged in strip form, wherein, for example, a multiplicity of strips lie next to one another.
- the deflection structure comprises a prismatic surface.
- a single prism of the prism-shaped surface is formed so that when entering infrared signals on the side surfaces of the prism, a change in direction of the radiation direction can take place.
- the predetermined preferred direction of the infrared signal can be deflected with respect to its entry angle when entering the inclined prism surfaces in a different direction from the radiation source preferred direction.
- the prism structure is transparent to infrared light.
- an optical unit is provided for bundling the optical signals.
- optical signals such as infrared signals
- Fresnel lenses or Fresnel lens arrays or mirror elements can be used.
- the deflection structure is formed in a black-colored, infrared-transmitting material.
- the infrared transparent material used here has the advantage that it is not transparent to visible light.
- such a device can be integrated in a central display of a vehicle.
- the deflection structure has a small thickness in relation to its areal extent.
- deflecting structures with a small thickness in relation to their areal extent has the advantage that, due to the resulting small overall depth of such a deflecting structure, it can be integrated in a multiplicity of devices, for example in a central display in a vehicle.
- FIG. 1 a vehicle 10 is shown in a schematic plan view.
- an optical radiation source 2 is arranged, which emits, for example, infrared signals 11.
- the preferred direction of the infrared signals 11 is deflected.
- the deflected preferred direction 15 which is shown as a dotted line, sends the infrared signals 11 to infrared receiver to position 9, which are integrated, for example, in a headphone 12, 12 'of a seated in the vehicle 10 passenger 16.
- the infrared signal 11 with the deflected preferred direction 15 thus has with respect to the axial longitudinal axis 13 of the Vehicle 10 a significant deviation, with a targeted alignment of infrared signals is carried out on the passenger 16.
- a radiation source 2 transmits infrared signals 11 in an original radiation direction 3 onto inclined surfaces 7 of a deflection structure 1.
- the inclined surfaces 7 are arranged for example on a prism-shaped surface 6, wherein a row-shaped arrangement of the inclined surfaces 7 is also conceivable.
- the infrared signal 11 occurring on the inclined surfaces 7 is deflected due to the refractive index of the deflection structure 1 (transition from a surrounding medium into a more optically denser medium) in a radiation direction 4, whereby a deviation from the original radiation direction sets.
- the emerging from the deflection structure 1 infrared signals 11 are transmitted with respect to the deflected radiation direction 4 to a position 9 of receivers 5, which are integrated, for example, in headphones 12, 12 ', of a seated in the passenger compartment 14 of a vehicle 10 passenger 16th be worn (see also FIG. 1 ).
- a bundling of the infrared signals 11 using a bundling element for example a Fresnel lens or a mirror, in the radiation path of the deflected radiation direction 4 is also feasible.
- FIG. 3 a lifelike image of a deflection structure 1 is shown, which has a relatively small thickness in relation to their areal extent.
- the deflection structure 1 for an integrated installation in devices with a relatively small overall depth, such as in a central display of a vehicle 10 well suited.
- the prism-shaped surface 6 of the deflecting structure 1 can be arranged on the side assigned to the beam source 2 so as to ensure a virtually smooth surface on the surface facing a receiver 5 (this is in FIG. 3 not apparent).
- the prism-shaped surface 6 can be formed in a nearly planar surface structure, whereby an increase in the thickness dimension with respect to the planar extension of the deflection structure 1 can be avoided.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
Description
Die Erfindung betrifft eine Vorrichtung für Fahrzeuge zur Übertragung von optischen Signalen nach dem Oberbegriff des Patentanspruches 1.The invention relates to a device for vehicles for the transmission of optical signals according to the preamble of
Eine Vorrichtung zur Übertragung von optischen Signalen ist beispielsweise aus der Druckschrift
Diese Druckschrift offenbart ein Entertainment System für Fahrzeuge, wobei von einer Signalquelle ausgehend Infrarot-Signale über einen Lichtleiter an einen Infrarotsender geleitet werden, welcher die Infrarotsignale an Infrarotempfänger im Fahrzeug sendet.This document discloses an entertainment system for vehicles, wherein from a signal source, infrared signals are transmitted via an optical fiber to an infrared transmitter, which transmits the infrared signals to infrared receiver in the vehicle.
Es handelt es sich hierbei um einen Infrarotsender, welcher die Infrarotsignale auf unterschiedlich platzierte Infrarotempfänger in einem Fahrzeug sendet.It is an infrared transmitter which transmits the infrared signals to differently placed infrared receivers in a vehicle.
Dabei weist der Infrarotsender aufgrund des Abstandes zu dem Infrarotempfänger eine entsprechend breite Abstrahlcharakteristik auf.In this case, the infrared transmitter due to the distance to the infrared receiver on a correspondingly broad radiation characteristic.
Die Aufgabenstellung zur vorliegenden Erfindung wird darin gesehen, eine Vorrichtung zur Übertragung optischer Signale bereitzustellen, die einen verbesserten Empfang für Empfänger ermöglicht.The object of the present invention is seen to provide a device for transmitting optical signals, which enables improved reception for receivers.
Die Aufgabe wird durch die Merkmale des Anspruches 1 gelöst.The object is solved by the features of
Vorteilhafte Erweiterungen der Erfindung sind in den abhängigen Ansprüchen beschrieben.Advantageous extensions of the invention are described in the dependent claims.
Die Erfindung geht von einer Vorrichtung für Fahrzeuge zur Übertragung von optischen Signalen, beispielsweise Infrarot-Signalen aus, die eine optische Strahlungsquelle umfasst, welche eine vorgegebene Strahlungscharakteristik mit einer Vorzugsrichtung aufweist.The invention relates to a device for vehicles for transmitting optical signals, for example infrared signals, which comprises an optical radiation source which has a predetermined radiation characteristic with a preferred direction.
Der Kern der Erfindung liegt darin, dass eine erfindungsgemäße Umlenkstruktur im Strahlungsgang nach der Strahlungsquelle vorgesehen ist, mit welcher eine Umlenkung der Vorzugsrichtung der Strahlungscharakteristik erzielbar ist.The core of the invention is that a deflection structure according to the invention is provided in the radiation path after the radiation source, with which a deflection of the preferred direction of the radiation characteristic can be achieved.
Der Erfindung liegt die Erkenntnis zugrunde, dass aufgrund einer Umlenkung der Vorzugsrichtung eine gezielte Bestrahlung eines optischen Empfängers ausführbar ist.
Gleichzeitig werden weiter außerhalb des Strahlungsfeldes befindliche optische Empfänger nicht angestrahlt werden.
Dies führt zu einer effizienten Bestrahlung des erwünschten Empfängers mit dem optischen Signal.The invention is based on the finding that, due to a deflection of the preferred direction, targeted irradiation of an optical receiver can be carried out.
At the same time, optical receivers located further outside the radiation field will not be illuminated.
This results in efficient irradiation of the desired receiver with the optical signal.
Durch eine derartige Umlenkung eines optischen Signals kann beispielsweise ein Beifahrer, ausgehend von einer optischen Strahlungsquelle, gezielt bestrahlt werden, um zum Beispiel ein elektronisches Gerät am Beifahrer oder in dessen Umgebung mit Datensignalen zu versorgen.Such a deflection of an optical signal, for example, a passenger, starting from an optical radiation source, are selectively irradiated to supply, for example, an electronic device on the passenger or in the vicinity with data signals.
Eine unerwünschte Bestrahlung des Fahrers mit optischen Signalen, wie beispielsweise Infrarot-Signale, kann somit vermieden werden.Unwanted irradiation of the driver with optical signals, such as infrared signals, can thus be avoided.
Allgemein sendet eine optische Strahlungsquelle, wie beispielsweise eine Infrarot-Strahlungsquelle, die optischen Signale in einem "Strahlungskegel" an einen Empfänger.Generally, an optical radiation source, such as For example, an infrared radiation source, the optical signals in a "cone of radiation" to a receiver.
Dabei können alle im Strahlungskegel liegenden Empfänger Signale empfangen. Regelmäßig weisen Strahlungskegel von LED's, die im Infrarotbereich senden, einen Raumwinkel von 10 bis 60 Grad auf.All receivers in the radiation cone can receive signals. Radiation cones of LEDs emitting in the infrared range regularly have a solid angle of 10 to 60 degrees.
Eine Reihe von Strahlungsquellen, insbesondere für Infrarot-Licht können auch mit einem deutlich kleineren Strahlungskegel senden.A number of radiation sources, especially for infrared light can also transmit with a much smaller radiation cone.
Empfänger die im Randbereich des Strahlungskegels liegen, können das Signal gegebenenfalls nur mit unerwünschten Qualitätsverlusten empfangen.Receivers located in the edge region of the radiation cone, the signal may only receive unwanted loss of quality.
Darüber hinaus kann eine unerwünschte Bestrahlung eines gerade noch im Strahlungskegel befindlichen Empfängers als störend empfunden werden.In addition, unwanted irradiation of a receiver just in the radiation cone can be perceived as disturbing.
Durch eine gezielte Ausrichtung der Vorzugsrichtung der Strahlungscharakteristik lassen sich solche Nachteile vermeiden.By a targeted orientation of the preferred direction of the radiation characteristic, such disadvantages can be avoided.
In einer vorteilhaften Ausgestaltung der Erfindung ist es vorgesehen, dass die Umlenkstruktur in Bezug auf die Strahlungsrichtung einer Strahlungsquelle eine geneigte Oberfläche aufweist.In an advantageous embodiment of the invention, it is provided that the deflection structure has an inclined surface with respect to the radiation direction of a radiation source.
Die geneigte Oberfläche kann eine Umlenkung der Strahlungsrichtung eines eintretenden Infrarot-Signals ausführen, wodurch die Vorzugsrichtung der Strahlungscharakteristik geändert wird.The inclined surface may deflect the radiation direction of an incoming infrared signal, thereby changing the preferential direction of the radiation pattern.
Tritt beispielsweise ein optisches Signal in einem Winkel auf die geneigte Oberfläche, findet eine Brechung des optischen Signals zu oder weg von der Senkrechten auf die geneigte Oberfläche statt, je nachdem welche Brechungsindizes an der Übergangsstelle der geneigten Oberfläche vorliegen.For example, if an optical signal at an angle to the inclined surface, a refraction of the optical signal to or away from the perpendicular to the inclined surface takes place, depending on which refractive indices at the Transition point of the inclined surface are present.
Vorzugsweise werden die optischen Verhältnisse so gewählt, dass eine Brechung zur Senkrechten auf die geneigte Oberfläche beim Eindringen des Lichtes stattfindet.Preferably, the optical ratios are chosen such that refraction to the normal to the inclined surface occurs upon penetration of the light.
Um eine große Fläche für einen Umlenkeffekt zu erreichen, können mehrere geneigte Oberflächen vorgesehen sein. Die Oberflächen können beispielsweise streifenförmig angeordnet sein, wobei zum Beispiel eine Vielzahl von Streifen nebeneinander liegen.In order to achieve a large area for a deflection effect, a plurality of inclined surfaces may be provided. The surfaces may, for example, be arranged in strip form, wherein, for example, a multiplicity of strips lie next to one another.
Im Weiteren ist es bevorzugt, dass die Umlenkstruktur eine prismenförmige Oberfläche umfasst.Furthermore, it is preferred that the deflection structure comprises a prismatic surface.
Mit einer prismaförmigen Oberfläche werden eine Vielzahl von Brechungsflächen ausgebildet.With a prismatic surface, a plurality of refracting surfaces are formed.
Vorzugsweise ist ein einzelnes Prisma der prismenförmigen Oberfläche, so ausgebildet, dass beim Eintritt von Infrarot-Signalen auf die Seitenflächen des Prismas eine Richtungsänderung der Strahlungsrichtung stattfinden kann.Preferably, a single prism of the prism-shaped surface, is formed so that when entering infrared signals on the side surfaces of the prism, a change in direction of the radiation direction can take place.
Die vorgegebene Vorzugsrichtung des Infrarot-Signals kann mit Bezug auf dessen Eintrittswinkel beim Eintritt in die geneigten Prismenflächen in eine von der Strahlungsquelle abweichende Vorzugsrichtung umgelenkt werden.The predetermined preferred direction of the infrared signal can be deflected with respect to its entry angle when entering the inclined prism surfaces in a different direction from the radiation source preferred direction.
Vorteilhafterweise ist die Prismenstruktur für Infrarot-Licht durchlässig.Advantageously, the prism structure is transparent to infrared light.
In einer überdies bevorzugten Ausgestaltung der Erfindung ist es vorgesehen, dass eine optische Einheit zur Bündelung der optischen Signale vorgesehen ist.In a further preferred embodiment of the invention, it is provided that an optical unit is provided for bundling the optical signals.
Zur Bündelung von optischen Signalen, wie beispielsweise Infrarot-Signale können beispielsweise Fresnel-Linsen bzw. Fresnel-Linsen-Arrays bzw. Spiegelelemente verwendet werden.For bundling optical signals, such as infrared signals, for example, Fresnel lenses or Fresnel lens arrays or mirror elements can be used.
Aufgrund dieser Bündelung kann eine weitere Konzentration der Signale auf eine erwünschte Stelle stattfinden. Damit lässt sich die Empfangsqualität von insbesondere Infrarot-Signalen weiter verbessern.Due to this bundling, further concentration of the signals can take place at a desired location. This further improves the reception quality of, in particular, infrared signals.
Im Weiteren ist es bevorzugt, dass die Umlenkstruktur in einem schwarzfarbigen, infrarot durchlässigen Material ausgebildet ist.Furthermore, it is preferred that the deflection structure is formed in a black-colored, infrared-transmitting material.
Das hier verwendete infrarot durchlässige Material weist den Vorteil auf, dass dieses für sichtbares Licht nicht durchlässig ist.The infrared transparent material used here has the advantage that it is not transparent to visible light.
Dadurch sind Konturen von hinter dem Material angeordneten Elementen nicht sichtbar, wodurch sich große Anwendungsmöglichkeiten bilden, insbesondere vielfältige Designaspekte verwirklicht werden können.As a result, contours of arranged behind the material elements are not visible, which form great applications, especially diverse design aspects can be realized.
Beispielsweise ist eine derartige Vorrichtung in einem Zentraldisplay eines Fahrzeuges integrierbar.For example, such a device can be integrated in a central display of a vehicle.
In einer weiteren vorteilhaften Ausgestaltung der Erfindung weist die Umlenkstruktur in Bezug auf ihre flächige Erstreckung eine geringe Dicke auf.In a further advantageous embodiment of the invention, the deflection structure has a small thickness in relation to its areal extent.
Die Ausbildung derartiger Umlenkstrukturen mit einer geringen Dicke in Bezug auf ihre flächige Erstreckung hat den Vorteil, dass aufgrund der sich daraus ergebenden geringen Bautiefe einer derartigen Umlenkstruktur diese in einer Vielzahl von Vorrichtungen integrierbar ist, beispielsweise in einem Zentraldisplay in einem Fahrzeug.The formation of such deflecting structures with a small thickness in relation to their areal extent has the advantage that, due to the resulting small overall depth of such a deflecting structure, it can be integrated in a multiplicity of devices, for example in a central display in a vehicle.
Durch eine vorgegebene Materialauswahl ist es ebenfalls denkbar, auf die Umlenkeigenschaften Einfluss zu nehmen. Im Besonderen kann dadurch das Brechungsverhalten so angepasst werden, dass eine Umlenkung im gewünschten Ausmaß stattfindet.By a given material selection, it is also conceivable to influence the deflection properties. In particular, this allows the refractive behavior to be adjusted so that a deflection takes place to the desired extent.
Weitere Merkmale der Erfindung gehen aus der nachfolgenden Figurenbeschreibung hervor.Further features of the invention will become apparent from the following description of the figures.
Dabei zeigen:
- Figur 1:
- in einer Draufsicht ein Fahrzeug, in welcher stark schematisiert eine Umlenkung der Vorzugsrichtung eines optischen Signals zwischen Sender und Empfänger veranschaulicht wird;
- Figur 2:
- eine schematische Ansicht einer Umlenkstruktur mit deren Strahlungscharakteristik;
- Figur 3:
- eine naturgetreue Ansicht einer Umlenkstruktur in einer flächig erstreckten Ausführungsform.
- FIG. 1:
- in a plan view of a vehicle in which a highly schematic of a deflection of the preferred direction of an optical signal between transmitter and receiver is illustrated;
- FIG. 2:
- a schematic view of a deflection structure with its radiation characteristic;
- FIG. 3:
- a faithful view of a deflection structure in a flat extended embodiment.
In
Aufgrund einer im Strahlungsgang der Strahlungsquelle 2 nachgeordneten Umlenkstruktur 1 (in
Die umgelenkte Vorzugsrichtung 15, welche als gepunktete Gerade dargestellt ist, sendet die Infrarot-Signale 11 auf Infrarot-Empfänger zu Position 9, welche beispielsweise in einem Kopfhörer 12, 12' eines im Fahrzeug 10 sitzenden Fahrgastes 16 integriert sind.The deflected
Das Infrarot-Signal 11 mit der umgelenkten Vorzugsrichtung 15 weist damit mit Bezug auf die axiale Längsachse 13 des Fahrzeuges 10 eine deutliche Abweichung auf, wobei ein gezielte Ausrichtung von Infrarot-Signalen auf den Fahrgast 16 ausgeführt wird.The
In
Die geneigten Oberflächen 7 sind beispielsweise auf einer prismenförmigen Oberfläche 6 angeordnet, wobei ein reihenförmige Anordnung der geneigten Oberflächen 7 ebenfalls denkbar ist.The
Das auf die geneigten Oberflächen 7 auftretende Infrarot-Signal 11 wird aufgrund der Brechungszahl der Umlenkstruktur 1 (Übergang von einem umgebenden Medium in ein optisch dichteres Medium) in eine Strahlungsrichtung 4 umgelenkt, wodurch sich eine Abweichung zur ursprünglichen Strahlungsrichtung einstellt.The
Die aus der Umlenkstruktur 1 austretenden Infrarot-Signale 11 werden mit Bezug auf die umgelenkte Strahlungsrichtung 4 auf eine Position 9 von Empfängern 5 gesendet, welche beispielsweise in Kopfhörern 12, 12' integriert sind, die von einem im Fahrgastraum 14 eines Fahrzeuges 10 sitzenden Fahrgastes 16 getragen werden (siehe auch
Zur Verbesserung der Empfangsqualität ist eine Bündelung der Infrarot-Signale 11 unter Verwendung eines Bündelungselementes (nicht dargestellt), beispielsweise einer Fresnel-Linse bzw. eines Spiegels, im Strahlungsgang der umgelenkten Strahlungsrichtung 4 ebenfalls durchführbar.In order to improve the reception quality, a bundling of the
In
Zusätzlich ist darauf hinzuweisen, dass die prismenförmige Oberfläche 6 der Umlenkstruktur 1 auf die der Strahlquelle 2 zugeordneten Seite angeordnet werden kann, um somit eine nahezu glatte Oberfläche auf der einem Empfänger 5 zugewandten Oberfläche zu gewährleisten (dies ist in
Entsprechend der vorgenannten Ausgestaltung, kann die prismenförmige Oberfläche 6 in einer nahezu planaren Flächenstruktur gebildet werden, wodurch eine Vergrößerung des Dickenmaßes in Bezug auf die flächige Erstreckung der Umlenkstruktur 1 vermieden werden kann.According to the aforementioned embodiment, the prism-shaped
Claims (11)
dadurch gekennzeichnet, dass
eine Umlenkstruktur (1) im Strahlungsgang nach einer Strahlungsquelle (2) vorgesehen ist, mit welcher eine Umlenkung der Vorzugsrichtung der Strahlungscharakteristik erzielbar ist.Device for vehicles for transmitting optical signals, for example infrared signals, with an optical radiation source having a predetermined radiation characteristic with a preferred direction,
characterized in that
a deflection structure (1) is provided in the radiation path after a radiation source (2) with which a deflection of the preferred direction of the radiation characteristic can be achieved.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008041337A DE102008041337A1 (en) | 2008-08-19 | 2008-08-19 | IR optics for audio transmission |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2157712A1 true EP2157712A1 (en) | 2010-02-24 |
| EP2157712B1 EP2157712B1 (en) | 2016-03-30 |
Family
ID=41264107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09164287.6A Not-in-force EP2157712B1 (en) | 2008-08-19 | 2009-07-01 | IR-lens for audio transmission |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20100046960A1 (en) |
| EP (1) | EP2157712B1 (en) |
| DE (1) | DE102008041337A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3010570B1 (en) * | 2013-09-09 | 2015-09-18 | Valeo Vision | COMMUNICATION DEVICE FOR EQUIPPING A MOTOR VEHICLE HABITACLE |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0671613A1 (en) * | 1994-03-09 | 1995-09-13 | TEMIC TELEFUNKEN microelectronic GmbH | Optical system |
| DE19532680A1 (en) | 1995-09-05 | 1997-03-06 | Telefunken Microelectron | Optical system |
| DE19725898A1 (en) | 1997-06-13 | 1998-12-17 | Brose Fahrzeugteile | Entertainment system for motor vehicle |
| EP1487136A2 (en) * | 2003-06-13 | 2004-12-15 | Delphi Technologies, Inc. | Asymmetric broadband optical wireless network |
| EP1855398A1 (en) * | 2002-10-24 | 2007-11-14 | Nakagawa Laboratories, Inc. | Illumination light communication device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6091530A (en) * | 1997-12-24 | 2000-07-18 | Recall Services, Inc. | Low power infrared communication system |
| JP2003294857A (en) * | 2002-03-29 | 2003-10-15 | Mitsubishi Electric Corp | Occupant detecting device |
| US20040218766A1 (en) * | 2003-05-02 | 2004-11-04 | Angell Daniel Keith | 360 Degree infrared transmitter module |
| JP4160031B2 (en) * | 2004-08-27 | 2008-10-01 | 本田技研工業株式会社 | Video display device for vehicle |
-
2008
- 2008-08-19 DE DE102008041337A patent/DE102008041337A1/en not_active Ceased
-
2009
- 2009-07-01 EP EP09164287.6A patent/EP2157712B1/en not_active Not-in-force
- 2009-08-14 US US12/541,585 patent/US20100046960A1/en not_active Abandoned
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0671613A1 (en) * | 1994-03-09 | 1995-09-13 | TEMIC TELEFUNKEN microelectronic GmbH | Optical system |
| DE19532680A1 (en) | 1995-09-05 | 1997-03-06 | Telefunken Microelectron | Optical system |
| DE19725898A1 (en) | 1997-06-13 | 1998-12-17 | Brose Fahrzeugteile | Entertainment system for motor vehicle |
| EP1855398A1 (en) * | 2002-10-24 | 2007-11-14 | Nakagawa Laboratories, Inc. | Illumination light communication device |
| EP1487136A2 (en) * | 2003-06-13 | 2004-12-15 | Delphi Technologies, Inc. | Asymmetric broadband optical wireless network |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2157712B1 (en) | 2016-03-30 |
| US20100046960A1 (en) | 2010-02-25 |
| DE102008041337A1 (en) | 2010-02-25 |
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